Rock-drill.



PATENTED JAN. 23, 1906.

A. H. GIBSON.

ROCK DRlLL. v APPLIUATION FILED JUNE 9. 1905.

UNITED 'STATES OFFIGE ARTHUR H. GIBSON, or EASTON,v PENNsYIvANIAQASSIGNORTO THE INGERsOLL-SIIRGEANT DRILL COMPANY, OF

CORPORATION OF WEST VIRGINIA.

To all `whom, tyran/y concern: l

Be it known that I, ARTHUR H. GIBSON', a

'subject of the King of Great Britain, land a' v'resident of Easton, in 'the county of orthl-l ampton and State of Pennsylvania, have invented-a new-and useful Improvement in.

Rock-Drills, of which the following 1s a speciication. f The object of this present invention is to provide certain improvements in rock-drills,

and especially that class of drill which is used a balanced drill are obtained Without the ne4 cessity of makngthe drill too lon o r clumsy for convenient operation, the tai -iod being` at`th same time entirely inclosed within the cylinder, and thereby protected from exposuretodustanddirt.

AIn thel accompanying. drawing van electro# pneumatic presser 1s represented vin side elevation, and my improved rock-drill is represented in connection therewith in longitudinal central section.

The electropneumatic, presser is 'of that type which will impart a reciprocatory mo- The piston-head of the drill is denoted by 5, its hollow tail-rod by 6, and itsront rod the usual chuck-8 for the attachment of the drill-tool thereto.

The cylinder'is adjusted alo'ng the shell .1

' bly the usual screw 9, mounted to rotateln cross-bar .'10 of. the shell and/ turnin in a traveling nutl 1, carried by t@ drill-cy der casing.

The rie-bar is denoted by 12 and is mounted, asis usual, at the rear of the rear -extension 4. The said bar extends forwardly vinto Athe interior of the hollow tailfrod' 6 ofthe pi's-y specification f Letters Patent. Application ne@ Jane ,9, isos. serial No. 264.433

and by makin 'the Vtail-iodliollow and per- This front rod extends through the vfront head 3 of thedrill and is provided with municates with the air-space Within the hol-. am enabled to permit the free reciprocating movement of the IOS NEW YORK, iigAii Patented` .ian 2,3, i906. f'

ton and is there engaged-by a n utl, the t il-rd. This tail-rod 6 isgofvsubstan tially. he same diameter as the' fr'ont rod-7' and is fl ted to slide in a sleeve v14,'spaced i from the'inner Wallsof the rear extensionv 4v,' so as to form an annular air-chamber'` around the said sleeve. A small aperture 16a leads from this annular air-chamber 15 fto, the f eXteriOr.` `The interior of the tail-rod 6 isv open to the annular air-chamber 15 through one or'more ports 1T through the walls ofthe sleeve 1 4. ".A Washer 1 8 is located between the end-of the sleeve 14 and the rotation device foi-,the rifle-bar for preventing the leakage of air therethrough. A Washer 19 surrounds the tail-rod 6 at the rear endofthe piston-l chamber .20 to the front of the hollow sleeve 14 for preventing the leakage of air as-nruch as possible from the piston-chamber 20 along y between the tail-rod and sleeve into the chamber 15 the rear extension 4 of the cyl-- inder. Ports 21 22.`open into the 'pistonof the chamber, theport21 being connected by ya pipe 23 with one side of the presser-c linder 24 andthe port'22 lbeing. connected y a ipe 25 with the other side olf the pressercy inder.

pipe 25 to therear end of the/ bn-chamber 2 ated ball-valve. 27 arranged to' b'e Opened against the tension of its spring by pressure from within the pipe 25. Y

By makin the tail-rod and front rod of the 4* piston of su stantiallythe same diameters mittin the e-bar totelescope within the same am -enabled to produce a balanced; drill without the necessity of causing the tail-. l

head of thedrill and also without theneces-l sity of making the drill so'long as tobe un-v wieldy- Byproviding the annular chamber 15 in"r the rear-'extension of the cylinder which corn-k piston Without exposing the tail-rod to dust dirt; the oriiice 16 being use d simply as a chamber 20 at shortv distancesy from the ends Y 'oint intermediate the ends lof its stroke.

furthermore, this is the mean pressure inthe chamber 15 when the drill is. working.- the drill-piston approaches the limit of lts forward movement the pressurewithn thechamber 15- i's brought slightly below atmos hei-ie corrections iin Leners vPatentMoratoria. Y

aperture 16 is againtoo small to 5 with.-

ressure,-the aperture 16 being sol smalthat 1t will not permit theair from the external, atmosphere 'to be drawn into the chamber -before the piston is star-ted on its rearward movement. As the piston approachesthe limit of its rearward -movement the ressure in the chamber 15 will be raisedslight y above atmospheric pressure, for the reason that the ermit the free escape of the airtherethroug from the chamber 15 to the external atmosphere. The valueof -the aperture" 16 is that it permits a mean pressure within thechamber 15 substantia ly equal to atmospheric pressure, even though a siight amount of air aboveatmospheric pressure isforcedpast the Washer 19 and between the tail-rod and 'sleeveinto the chamber 15.

If this aperture were not provided, the mean pressure 1n the chamber 15 would rise above atmospheric pressure, and

vthe drill would no longer be a balanced drill,

and its proper Working would be illiterfered what I claim is 5 l The combination with a rock-drill cylin Ythe Patent Oce.

[SEA-11.]

Signed and sealed this 6th da); of February, A. D., 1906.

siones inder having a rear extension, of a piston having a hollow tail-rod extended into and entirely inclosed by said rear extension, a sleeve surrounding the tail-rod forming an annular chamber Within the rear extension, a riflebar telescopin within the tail-rod and a port leading from t e annular chamber to the airspace within the sleeve and tail-rod.

2. The combination with a rock-drill cyllinder having a rear extension, 'of a piston hav- `1ng a hollow tail-rod extended into and entirely-inclosed by said rear extension, a sleeve surrounding the 'tall-rod for-mingen annular ycharnbe" within the rear' extension, a riflebar tel scoping within the tailerod, a port leadingfrom the-annular chamber to the air-A spaceyvithin the sleeve and tail-rod and an aperture leading from the lannular chamber to-the exterior.

3. The combinationwith va rock-drill cyl- .inder having a rear extension, of a piston having a hollow tail-rod extended into and entirely inclosed by said rear extension, a hollow sleeve surroundingthe tail-rod, a washer 'surrounding the tail-rod for preventing asv much as possible the leakage of air past the same Jrorn the piston-chamber and a riflebar telescopingdlwithin the hollow tail-rod.

In testimony'lhat I claim the foregoing as my invention I have signed my name, in resfence of vo witnesses, this 7th dayl of. une, 1e05 y ARTHUR H. GIBSON.- Witnesses: I

CEAS. 12'. BRNNER, JOHN SNYDEn Y It is herebycertified that in Letters Patent No. 810,639, granted January 23,l 1906, upon the application-of lArthur H. Gibson, of Easton, Pennsylvania, for an improve-- ment in .Rock-DrllsW-errors appear requiring correction, as follows: In the specilication and claims the word presser wherever it occursshould read pff-essor and the word presse-rs should read pressors; xand that the said Letters latent should be read with these corrections therein that the saine mayconform to the recordof the case vF. I; ALLEN,

Commissioner of Patents.

Y 'oint intermediate the ends lof its stroke.

furthermore, this is the mean pressure inthe chamber 15 when the drill is. working.- the drill-piston approaches the limit of lts forward movement the pressurewithn thechamber 15- i's brought slightly below atmos hei-ie corrections iin Leners vPatentMoratoria. Y

aperture 16 is againtoo small to 5 with.-

ressure,-the aperture 16 being sol smalthat 1t will not permit theair from the external, atmosphere 'to be drawn into the chamber -before the piston is star-ted on its rearward movement. As the piston approachesthe limit of its rearward -movement the ressure in the chamber 15 will be raisedslight y above atmospheric pressure, for the reason that the ermit the free escape of the airtherethroug from the chamber 15 to the external atmosphere. The valueof -the aperture" 16 is that it permits a mean pressure within thechamber 15 substantia ly equal to atmospheric pressure, even though a siight amount of air aboveatmospheric pressure isforcedpast the Washer 19 and between the tail-rod and 'sleeveinto the chamber 15.

If this aperture were not provided, the mean pressure 1n the chamber 15 would rise above atmospheric pressure, and

vthe drill would no longer be a balanced drill,

and its proper Working would be illiterfered what I claim is 5 l The combination with a rock-drill cylin Ythe Patent Oce.

[SEA-11.]

Signed and sealed this 6th da); of February, A. D., 1906.

siones inder having a rear extension, of a piston having a hollow tail-rod extended into and entirely inclosed by said rear extension, a sleeve surrounding the tail-rod forming an annular chamber Within the rear extension, a riflebar telescopin within the tail-rod and a port leading from t e annular chamber to the airspace within the sleeve and tail-rod.

2. The combination with a rock-drill cyllinder having a rear extension, 'of a piston hav- `1ng a hollow tail-rod extended into and entirely-inclosed by said rear extension, a sleeve surrounding the 'tall-rod for-mingen annular ycharnbe" within the rear' extension, a riflebar tel scoping within the tailerod, a port leadingfrom the-annular chamber to the air-A spaceyvithin the sleeve and tail-rod and an aperture leading from the lannular chamber to-the exterior.

3. The combinationwith va rock-drill cyl- .inder having a rear extension, of a piston having a hollow tail-rod extended into and entirely inclosed by said rear extension, a hollow sleeve surroundingthe tail-rod, a washer 'surrounding the tail-rod for preventing asv much as possible the leakage of air past the same Jrorn the piston-chamber and a riflebar telescopingdlwithin the hollow tail-rod.

In testimony'lhat I claim the foregoing as my invention I have signed my name, in resfence of vo witnesses, this 7th dayl of. une, 1e05 y ARTHUR H. GIBSON.- Witnesses: I

CEAS. 12'. BRNNER, JOHN SNYDEn Y It is herebycertified that in Letters Patent No. 810,639, granted January 23,l 1906, upon the application-of lArthur H. Gibson, of Easton, Pennsylvania, for an improve-- ment in .Rock-DrllsW-errors appear requiring correction, as follows: In the specilication and claims the word presser wherever it occursshould read pff-essor and the word presse-rs should read pressors; xand that the said Letters latent should be read with these corrections therein that the saine mayconform to the recordof the case vF. I; ALLEN,

Commissioner of Patents.

It is hereby certified that in Lettera Patent No. 810,639, granted J anuary 23, 1906, upon the `application of Arthur H. Gibson, of Easton, Pennsylvania, for an improvement in Rock-Drills, errors appear requiring correction, as follows: In the specification and claims the word presser wherever it occurs should read pff-essor and the word pressers should read presaors; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Gce.

signed and Sealed this oth day of February, A. D., 190e [SEA L] F. I. ALLEN,

Cmnmisoncvof Patents. 

